Christina is Lee Anthony's fiancé. The recording was made while Casey was in jail, I think the first time, before she was bailed out.
Lee’s fiance is Mallory, not Christina. IIRC Christina lived in the neighborhood and sometimes cared for Caylee.
http://www.clickorlando.com/news/21595540/detail.html
Mallory Parker is Lee’s girlfriend. I don’t know who Christina is.
Brother Lee’s girlfriend name is Mallory not christina.